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pubnub-react
Advanced tools
This is the official PubNub React framework repository.
PubNub takes care of the infrastructure and APIs needed for the realtime communication layer of your application. Work on your app's logic and let PubNub handle sending and receiving data across the world in less than 100ms.
To use the PubNub React framework, you need:
This library is compatible with the latest versions of the React Native framework. For examples, refer to examples/reactnative.
You will need publish and subscribe keys to authenticate your app. Get your keys from the Admin Portal.
Follow these instructions to set up a simple chat app using PubNub.
Note: These instructions assume you're using JavaScript. If you'd prefer to use TypeScript, follow the instructions in the React framework documentation.
Set up your React project.
For a quick single-page app, create-react-app is a good starting point:
npx create-react-app react-sample-chat
Add the PubNub JavaScript SDK and React framework packages to your project:
cd react-sample-chat
npm install --save pubnub pubnub-react
Replace the contents of src/App.js
with the following, replacing myPublishKey
and mySubscribeKey
with your own keys, and myUniqueUUID
with a value of your choice:
import React, { useState, useEffect } from 'react';
import PubNub from 'pubnub';
import { PubNubProvider, usePubNub } from 'pubnub-react';
const pubnub = new PubNub({
publishKey: 'myPublishKey',
subscribeKey: 'mySubscribeKey',
uuid: 'myUniqueUUID'
});
function App() {
return (
<PubNubProvider client={pubnub}>
<Chat />
</PubNubProvider>
);
}
function Chat() {
const pubnub = usePubNub();
const [channels] = useState(['awesome-channel']);
const [messages, addMessage] = useState([]);
const [message, setMessage] = useState('');
const handleMessage = event => {
const message = event.message;
if (typeof message === 'string' || message.hasOwnProperty('text')) {
const text = message.text || message;
addMessage(messages => [...messages, text]);
}
};
const sendMessage = message => {
if (message) {
pubnub
.publish({ channel: channels[0], message })
.then(() => setMessage(''));
}
};
useEffect(() => {
pubnub.addListener({ message: handleMessage });
pubnub.subscribe({ channels });
}, [pubnub, channels]);
return (
<div style={pageStyles}>
<div style={chatStyles}>
<div style={headerStyles}>React Chat Example</div>
<div style={listStyles}>
{messages.map((message, index) => {
return (
<div key={`message-${index}`} style={messageStyles}>
{message}
</div>
);
})}
</div>
<div style={footerStyles}>
<input
type="text"
style={inputStyles}
placeholder="Type your message"
value={message}
onKeyPress={e => {
if (e.key !== 'Enter') return;
sendMessage(message);
}}
onChange={e => setMessage(e.target.value)}
/>
<button
style={buttonStyles}
onClick={e => {
e.preventDefault();
sendMessage(message);
}}
>
Send Message
</button>
</div>
</div>
</div>
);
}
const pageStyles = {
alignItems: 'center',
background: '#282c34',
display: 'flex',
justifyContent: 'center',
minHeight: '100vh',
};
const chatStyles = {
display: 'flex',
flexDirection: 'column',
height: '50vh',
width: '50%',
};
const headerStyles = {
background: '#323742',
color: 'white',
fontSize: '1.4rem',
padding: '10px 15px',
};
const listStyles = {
alignItems: 'flex-start',
backgroundColor: 'white',
display: 'flex',
flexDirection: 'column',
flexGrow: 1,
overflow: 'auto',
padding: '10px',
};
const messageStyles = {
backgroundColor: '#eee',
borderRadius: '5px',
color: '#333',
fontSize: '1.1rem',
margin: '5px',
padding: '8px 15px',
};
const footerStyles = {
display: 'flex',
};
const inputStyles = {
flexGrow: 1,
fontSize: '1.1rem',
padding: '10px 15px',
};
const buttonStyles = {
fontSize: '1.1rem',
padding: '10px 15px',
};
export default App;
In your project, run the following command:
npm start
You should see the following in your browser:
In the code in the previous section, the following adds a message listener in the Chat()
function:
useEffect(() => {
pubnub.addListener({ message: handleMessage });
pubnub.subscribe({ channels });
}, [pubnub, channels]);
Publishing a message:
const [channels] = useState(['awesome-channel']);
// ...
const sendMessage = message => {
if (message) {
pubnub
.publish({ channel: channels[0], message })
.then(() => setMessage(''));
}
};
Subscribing to a channel:
const [channels] = useState(['awesome-channel']);
// ...
useEffect(() => {
pubnub.addListener({ message: handleMessage });
pubnub.subscribe({ channels });
}, [pubnub, channels]);
The PubNubProvider makes available a PubNub client instance to a React component tree. You instantiate the provider as follows (note that this example assumes that your publish and subscribe keys are contained in the pubnub.config.json
file):
import PubNub from 'pubnub';
import { PubNubProvider } from 'pubnub-react';
const pubNubConfig = require('./pubnub.config.json');
const pubNubClient = new PubNub(pubNubConfig.Demo.keySet);
const App = () => {
return (
<PubNubProvider client={pubNubClient}>
<MyRootComponent />
</PubNubProvider>
);
};
export default App;
The PubNubProvider component takes a single prop:
The PubNub hook lets you interact with PubNub in function components.
Hooks are a new feature added in React 16.8 that allow you to use React features without writing a class. For a general overview of hooks, refer to the React documentation.
usePubNub
hook usageimport React, { useState, useEffect } from 'react';
import { usePubNub } from '../../src/index';
const PubNubTime = () => {
const client = usePubNub();
const [time, setTime] = useState(null);
const [error, setError] = useState(error);
useEffect(() => {
client
.time()
.then(({ timetoken }) => {
setTime(timetoken);
})
.catch(error => {
setError(error);
});
}, []);
if (error !== null) {
return <div>An error has occured: {error.message}</div>;
}
if (time === null) {
return <div>Loading...</div>;
}
return <div>Current time: {time}</div>;
};
export default PubNubTime;
Then, to load PubNubTime
on-demand, you could use React.Lazy
and Suspense
:
import React, { Suspense, lazy } from 'react';
const MyRootComponent = () => {
const DisplayPubNubTime = lazy(() => import('./PubNubTime'));
return (
<Suspense fallback={<div>Loading. . .</div>}>
<DisplayPubNubTime />
</Suspense>
);
};
export default MyRootComponent;
The PubNubConsumer allows you to access the client instance you made available with a PubNubProvider.
Note: Be careful, as the children function will be called every time component rerenders. Wrap components using PubNubConsumer using
React.memo
to prevent this behaviour.
The PubNubConsumer component takes a single prop:
Once you've created a PubNubProvider, you can access the client with a PubNubConsumer.
import React from 'react';
import PubNub from 'pubnub';
import { PubNubProvider } from '../PubNubProvider';
import { PubNubConsumer } from '../PubNubConsumer';
import { getPubNubContext } from '../PubNubContext';
const pubNubConfig = require('../config/pubnub.json');
const pubNubClient = new PubNub(pubNubConfig.Demo.keySet);
const App = () => {
return (
<PubNubProvider client={pubNubClient}>
<PubNubConsumer>
{client => 'success!' /* do something now */}
</PubNubConsumer>
</PubNubProvider>
);
};
If you need help or have a general question, contact support@pubnub.com.
FAQs
Publish & Subscribe Real-time Messaging with PubNub
We found that pubnub-react demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 5 open source maintainers collaborating on the project.
Did you know?
Socket for GitHub automatically highlights issues in each pull request and monitors the health of all your open source dependencies. Discover the contents of your packages and block harmful activity before you install or update your dependencies.
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